Their whole ML thing is super annoying. Basically, it means you can never disconnect your Mac from your USB-C monitor, lest it immediately charge to 100% upon a reconnect, and discharge back to 80% only a few days after keeping it at 100%.
I know the non-deterministic nature of this can be frustrating, but it actually has to charge to 100% every now and then in order to calibrate.
I have a few Dells several years old which have the same feature. The difference is that Apple prefers to control you, rather than the other way around.
Of course, questions are whether Apple’s solution can theoretically work good enough, and if so, whether their implementation is good enough.
They already don't provide 50% at all, even though my laptop has been kept connected to mains for 1 year straight. All I get is a range of 76% to 80% or so, with a battery life that keeps diminishing for no reason.
But, in reality, they don't even provide the 20% to 80% range, either, because it still charges to 100% on each disconnect, however brief it may be.
I've had multiple batteries completely fail within just a few years after being topped up to 100% all the time.
I also have a ThinkPad with a 15-year-old battery that's still working just fine (1 hour runtime is not that bad for such an old battery), because it's been kept at the 50% most of the time when I don't need to use it on the go. If it was kept at 100%, I'm pretty sure it wouldn't last 2 minutes now.